Blow-off plug for boilers



Nw. 27,1923. 'y A iff-15,718

' s. orls ET AL BLOW-OFF PLUG AFOR BOILRS Filed Feb. 12. 1921 @muni lilil SPENCER CTS N 'WALTER GARDNER, Si? CHECAGO, ILLINOIS.

BLOl-GEE PLUG FR BGLERS.

Application filed February 12, 1921.

To el! uff/om may concern.'

Re it known that we, Simi-:cnn Uris and lli/lauren A. (flannivicn,citizens of the United States, residing at Chicago, in the county ofCool: and Satc olE illinois, have invented certain new and us ulimprovements in Blow-@ft Plugs tor loilere, of which the followingspeciiication.

This invention relates 'to a plug to be inserted through the wall ot aboiler tor the purpose et blowing ofi the contents of the boiler incleaning it, and has for its object to provide a blowoil;l plug whichwill serve not only to release the lluid contents of the boiler but alsot@ introduce an air blast for stirring up the precipitate of the boileras a step prelii'ninary tc or concurrent with the blowotl.

iccordingly, the invention consists in providing a plug of suitableconstruction to adapt it to be introduced through the wall of a boilerhaving controlled passages therethrough, adapted, respectively, ttor theoutiioiv ot water and the injection ot air, the air passage beingconstructed at its inner end with a form that adapts it peculiarly tothe c evelopinent ot violent ebullition in the Water 'of the boiler tromthe air released thcreat. The control tor the water passage is manuallyactuated at will, while the control for the air passage. is preferablyin the -form of a check valve, seating with the pressure within theboiler, and unseating to admit air from without when supplied under asuilicient head of pressure. y

ln the accompanying drawing- Figure l is a view ot portion of alocomotive boiler suggesting one use to which the subject-matter of thepresent invention may be put.

Figure 2 is a vertical longitudinal section through the plug in a planewhich intersects its two passages; and

Figures 3 and 4 are, respectively, an outer end elevation and an innerend elevation of the same.

A represents the lire-box ot a boiler B of known construction. Crepresents a plurality of blowoif plugs embodying the subject-matter orthe present invention. As shown in .Figure 2, the plug C is intended tobe threaded into or otherwise tightly secured at C to the boiler plate Bin position to permit its inner end to assume proper relation to thewater to be stirred up and drawn oil'. ils suggested in Figure l, theseplugs may be Serial No. 444,395.

arranged in suitable numbers along the mud ring ot the boiler, and mayalso be located over the crown sheet. t is to be understood that thelength of the plug, and particularly that portion w rich extends withinthe boiler will bc varied according 'to the point beyond the inner taceof theboiler plate which it is desired to bring under immediateinfluence of the plug.

The plug C has a longitudinal passage C2 terminating in vertical passageC3, and a flaring discharge nozzle C4 through which air is introduced,said passage being guarded against back pressure from the boiler bymeans ot a cheek valve C5 which is guided in the screw plug C6 and madereadily removable tor cleaning the valve. The plug further providedwith'a passage C7 for" water which is controlled by a manually operatedvalve CS accessible from the outer side ot the boiler plate `B and whichstarts with the int-alie end C9 which is preferably closely related tothe flaring air nozzle C4. The outer ends ot the passages C2 and C7 areadapted to receive pipes, hose fittings, or the like, through which tocontinue passageways for the elements that are to How through thepassages, for instance, a hose connecting the blowoi passage C7 with theblowod pipe of a boiler washing system, and a lleXible connector unitingthe passage C2 with a suit able source of air under heavy pressure.

An important feature of the preferred embodiment of the inventionselected for illustration, is the particular section or form given tothat portion of the plug which lies inwardly beyond the threaded portionC', and which is shown in Figure e. This portion of the plug isrelatively narrow so that it offers a minimum resistance to the violentebullition of the air released through the flaring nozzle C4 and permitsthe volume of air to rise violently through the water and develop thestirring effect desired.

Another important feature of a device of this kind and particularly ofthe air delivery passage, though not broadly of the present invention,consists in havingF a prolonged upwardly extending air trap between thedischarge end and 'the air valve, provided in this .instance by thevertical leg C3 and inner portion of horizontal leg C2 of the airpassage in which is trapped.v after shutting oil' the flow, a suiiicientbody ot air to exclude boiler water from the air valve and therebyprotect the valve from corrosion,

CII

1We claim:

l. A combined air blast and water blowoff plug for steam boilers havingcontrolled passages for air and water therethrough, communicatingindependently with the interior of the boiler and adapted respectivelyto 'deliver air thereto and withdraw water therefrom.

2. A combined air blast and water blowoff plug for steam boilers havingcontrolled passages for air and water therethrough independentlycommunicating with the interior olf the boiler; the air passage of saidplug terminating in a downwardly presented flaring nozzle.

3. A combined air `blast and water blowoff plug for steam boilers havingcontrolled passages for air and water therethrough; the air passageincluding a downwardly eX- tending portion; and the water passagecommunicating with the interior of the boiler adjacent the inner end ofthe air passage.

Al. A combined air blast and water blewol" plug for steam boilers havingpassages for air and water therethrough communicating independently withthe interior of the boiler; said water passage having a inanuallycontrolled valve; and said air passage having an independently actingvalve.

5. In combination with a steam boiler, a

combined blowol and agitating plug fixed in the wall or' the boiler andhaving controlled independent air and water passages therethroughestablishing communication between the interior of the boiler and theexterior thereof and adapted respectively to deliver air into the boilerand release water therefrom.

G. In combination with the mud ring or" a steam boiler, a combined airstirring and liquid blowoff plug introduced through the wall of theboiler, and having air and fluid passages therethrough independentlyconnnuneating with the interior of the boiler adjacent the mud ring andadapted respectively to release air into and withdraw water Yfrom theboiler. Y

7. A combined air stirring and liquid blowol plug adapted to beintroduced into the wall of a boiler, having valved passages for air andbloworl'l products; the air passage being in the upper part of the pluand communicating with the boiler thro downwardly extending leg, and itsvalve being located in an upper portion of the passage.

8. A blasting plug for boilers having a horizontally extending airpassage with a downwardly extending discharge leg, and a cheek valve insaid passage located in the horizontal part thereof remote from its junction with the downwardly extending discharge leg.

Signed at Chicago, Illinois, this 10th day of February, 1921.

SPENCER OTIS. VALTER A. GARDNER.

